Analýza kumulace únavového poškození zkušebních těles vyrobených S690 a S960
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Date
Authors
Al Khazali, Mohammad Sami
ORCID
Advisor
Referee
Mark
B
Journal Title
Journal ISSN
Volume Title
Publisher
Vysoké učení technické v Brně. Fakulta stavební
Abstract
This thesis study and examines the behavior of high strength steels (HSS) during fatigue utilizing S-N curves of models based on the Palmgren-Miner Rule and some invented hypotheses, such as Haibach's model, Corten-Dolan's model and Serensen-Kogajev model. Firstly, a detailed mechanical testing will be done and discussed to ensure creating a proper understanding of the two types of steel that will be the focal point of the research. The curves created are interpolated using measured data form cyclically loaded of the steel to create the relation between the number of cycles the material can withstand before reaching failure state and the level of stress applied on a variety of specimens with different homogenizes but similar characteristics. The accuracy of each model is determined for each grade of steel, the S690 and the S960. Then we will conclude by the end of the work which can be considered suitable and which not of each model and an explanation of the reasoning behind the results achieved to ensure better outcome in future related work.
This thesis study and examines the behavior of high strength steels (HSS) during fatigue utilizing S-N curves of models based on the Palmgren-Miner Rule and some invented hypotheses, such as Haibach's model, Corten-Dolan's model and Serensen-Kogajev model. Firstly, a detailed mechanical testing will be done and discussed to ensure creating a proper understanding of the two types of steel that will be the focal point of the research. The curves created are interpolated using measured data form cyclically loaded of the steel to create the relation between the number of cycles the material can withstand before reaching failure state and the level of stress applied on a variety of specimens with different homogenizes but similar characteristics. The accuracy of each model is determined for each grade of steel, the S690 and the S960. Then we will conclude by the end of the work which can be considered suitable and which not of each model and an explanation of the reasoning behind the results achieved to ensure better outcome in future related work.
This thesis study and examines the behavior of high strength steels (HSS) during fatigue utilizing S-N curves of models based on the Palmgren-Miner Rule and some invented hypotheses, such as Haibach's model, Corten-Dolan's model and Serensen-Kogajev model. Firstly, a detailed mechanical testing will be done and discussed to ensure creating a proper understanding of the two types of steel that will be the focal point of the research. The curves created are interpolated using measured data form cyclically loaded of the steel to create the relation between the number of cycles the material can withstand before reaching failure state and the level of stress applied on a variety of specimens with different homogenizes but similar characteristics. The accuracy of each model is determined for each grade of steel, the S690 and the S960. Then we will conclude by the end of the work which can be considered suitable and which not of each model and an explanation of the reasoning behind the results achieved to ensure better outcome in future related work.
Description
Citation
AL KHAZALI, M. Analýza kumulace únavového poškození zkušebních těles vyrobených S690 a S960 [online]. Brno: Vysoké učení technické v Brně. Fakulta stavební. 2023.
Document type
Document version
Date of access to the full text
Language of document
en
Study field
bez specializace
Comittee
prof. Ing. Milan Ostrý, Ph.D. (místopředseda)
Ing. Karel Struhala, Ph.D. (člen)
doc.ing.arch. Milan Palko, Ph.D (předseda)
doc. Ing. Petr Horák, Ph.D. (člen)
prof. Ing. Jan Eliáš, Ph.D. (člen)
prof. Ing. Miroslav Vořechovský, Ph.D. (člen)
Date of acceptance
2023-02-01
Defence
Comments and questions of the opponent:
1) For interest, could you please mention typical Vickers hardness values of several common materials? ... ANSWERED
2) Can you please explain what the damage coefficient r in Eq. 5 is and what its values are ... ANSWERED
3) Page 36 – please, where the values of k = 23*10-5 and (sigma)c = 770 MPa comes from? It is not clear from the thesis. Similarly, page 38. ... ANSWERED
4) The opponent wonders about the Ni values (number of cycles to failure) in Tab. 15 for the defined stress levels. They are significantly lower than the number of cycles you applied during the experiment (Tab. 7) without specimen failure. Can you please comment on this inconsistency? ... DISCUSSED, ANSWERED
After answering the opponent's questions, a discussion was held with the members of the committee.
Verbal evaluation:
The student with a very good overview took professional positions on all the comments of the opponent and responded well to all the questions of the committee members that were asked about the defended thesis.
Result of defence
práce byla úspěšně obhájena
Document licence
Standardní licenční smlouva - přístup k plnému textu bez omezení